High Sierra Trail in Mid-August: Crescent Meadow to Whitney's Summit

The High Sierra Trail isn't a weekend trip. It's a full trans-Sierra crossing, starting at Crescent Meadow (7,030 ft) in Sequoia National Park and finishing on the summit of Mount Whitney at 14,505 ft. That's over 15,500 ft of cumulative gain packed into roughly 72 miles, and most parties need 6 to 8 days to do it right. Mid-August is prime season for this route. Snow is long gone from the high passes by now, days are warm and stable, and afternoon thunderstorms are the main weather variable to plan around, especially once you're above 11,000 ft past mile 40. Start early each day and be off exposed ridgelines by early afternoon. Permit-wise, this is a zone permit booked through Recreation.gov (permit 445857), not a first-come first-served walk-up situation. Cost is $15 for the reservation plus $5 per person per night. There's no published daily quota number for this specific itinerary, but trans-Sierra zone permits for the HST corridor book up fast for August dates, so get your reservation locked in well before your trip, not the week before. The route profile tells the real story. You climb steadily but manageably for the first 17 miles to Hamilton Lake (8,950 ft), then the trail holds a high, rolling bench through Big Arroyo (mile 23.2, 8,833 ft) before the terrain tips upward for good starting around mile 30. From there it's a long, sustained grind: by mile 44.8 you're at nearly 12,000 ft, and the trail stays above 12,500 ft for a long stretch through the high mile-50s and 60s before the final push to Trail Crest (mile 69.6, 13,047 ft) and the Whitney summit block. That last 8 miles from Trail Crest to the summit is where altitude actually bites people. You're gaining another 1,450+ ft above 13,000 ft, air is thin, and afternoon storms build fast on that exposed final ridge. Budget a pre-dawn start for summit day and have a bailout plan if clouds stack up early. Water is generally reliable in August along the lower and mid sections thanks to snowmelt-fed creeks and lakes near Hamilton Lake and Big Arroyo, but treat everything and don't count on flowing water once you're deep into the high alpine miles past mile 50 — carry extra capacity through the dry, rocky stretches. Common mistakes: underestimating the mileage-to-elevation ratio (this isn't a fast 72 miles), skipping acclimatization nights before the Whitney push, and not checking exit logistics — most parties finish via the Whitney Portal side, which means you need a shuttle or second vehicle staged well in advance since you don't loop back to your starting trailhead. — Compiled by the PermitSnag team from agency info, ranger updates, and public trip logs.